Multiple Choice
Which of the following statements about abstract base classes is true
A) abstract base classes may contain data.
B) abstract base classes may not contain implementations of methods.
C) abstract base classes must declare all methods as abstract.
D) abstract base classes must declare all data members not given values as abstract.
Correct Answer:
Verified
Correct Answer:
Verified
Q21: All methods in an abstract class are
Q22: Concrete classes provide implementations for every method
Q23: Which of the following does not complete
Q24: A concrete class that implements an interface
Q26: All methods in a sealed class must
Q27: _ code is the process by which
Q28: A(n)_ is best used for providing services
Q29: The purpose of an interface is to:<br>A)
Q30: An abstract class may be derived from
Q33: Interfaces can have _methods.<br>A) 0<br>B) 1<br>C) 2<br>D)